Fixed left panel in explore view

panoramix/static/panoramix.css

@@ -2,6 +2,17 @@ html>body{
     margin: 0px; !important
 }
 
+.col-left-fixed {
+    width:350px;
+    position: absolute;
+    float: left;
+}
+.col-offset {
+    margin-left: 365px;
+}
+
+
+
 .padded{
     padding: 10px;
 }

panoramix/templates/panoramix/explore.html

@@ -53,7 +53,7 @@
         <hr/>
     </div>
     <div class="row">
-      <div id="form_container" class="col-md-3">
+      <div id="form_container" class="col-left-fixed">
         {% for fieldset in form.fieldsets %}
             <fieldset class="fs-style">
               {% if fieldset.label %}
@@ -139,7 +139,7 @@
         <br>
       </div>
 
-      <div class="col-md-9">
+      <div class="col-offset">
         {% block messages %}{% endblock %}
         {% include 'appbuilder/flash.html' %}
         <div